Grumpy Old Geeks People Walter Koenig Person Walter Koenig 2 mentions in 1 episode Walter Koenig is an actor the hosts remember for playing Chekov in the original Star Trek series. Mentions 769: Mommie Dearest Maxxing Oct 29, 2026 1:01:24 Actor Walter Koenig is now dead at 90. He played Chekhov in the original Star Trek series. 1:02:14 Sad to see him go.